/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/SNiagaraParameterEditor.h
Sets the OnBeginValueChange delegate which is run when a continuous internal value change begins.
void SetOnBeginValueChange ( [FOnValueChange](API\Plugins\NiagaraEditor\SNiagaraParameterEditor\FOnValueChange) InOnBeginValueChange )